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Did a quick search and didn't find anything for aftermarket exhaust. I have an 07 and would like to see if there are any exhaust mods available for this car. i would love to let it breath and hear it grunt when I step on it.

Also, anyone use the K&N Filter? Did you notice a difference is performance, sound, gas milage, etc.?

Here is something that may help the folks looking for extra power and the bad tranny shifting:

From bav auto parts

Got throttle lag? Put the punch back in your pedal and accelerate with confidence. The Sprint Booster power converter is an easy-to-install, electronic device that eliminates the delay in acceleration common in cars with Electronic Throttle Control (ETC, a.k.a. "drive by wire"). You get crisp acceleration on tap, whenever you want it, dramatically improving acceleration response time and your overall driving experience. (In other words, "Yee-haw!!!") It doesn't increase your car's horsepower -- it just make the car more responsive to your commands. You'll notice better off-the-line acceleration, faster 1/4-mile times, greater quickness when passing and easier on-hill starts. The Sprint Booster plugs in between the accelerator pedal and the ECM (Engine Control Module) where it continuously measures the digital signal being sent by the accelerator, modifies the signal and sends it on to the ETC, which tells the engine to respond more quickly. We tested it here at Bavarian Autosport and loved it! The installation took less than 10 minutes, and no modifications or changes in fuel are required. The first time we depressed the pedal, an instant smile appeared on our face... and didn't leave until an hour after we had climbed out of the car. Please note: There are different Sprint Boosters for manual and automatic transmissions -- make sure you are ordering the correct version for your car. One of the most noticeable performance upgrades you can do. Backed by a lifetime warranty.

I was unhappy with the throttle response on my automatic '06, so I had the Dinan stage 1 software installed, which does reduce the lag quite a bit. It also changed the shift points when in manual mode, which I never liked in the first place. I have been very happy so far, and wasn't put off by the $300 price tag. I also put a high flow air filter in because that is what Dinan recommended.

I was unhappy with the throttle response on my automatic '06, so I had the Dinan stage 1 software installed, which does reduce the lag quite a bit. It also changed the shift points when in manual mode, which I never liked in the first place. I have been very happy so far, and wasn't put off by the $300 price tag. I also put a high flow air filter in because that is what Dinan recommended.

I know on my Z3 the software was a great improvement.

The high flow air filter - is this a cold air intake for the X3? I had a carbon fiber tube with high flow filter on my Z3. Expensive but nice. Or is it a filter that goes into the existing housing?

I had SuperSprint on my 2.8 Z3 and LOVED the sound. That plus Dinan cold air intake, performance chip, Eibach springs, anti-roll kit, etc. Great punch and acceleration!

I thought about ordering it, but didn't know much about SuperSprint and their quality at that time. Nor did I have any idea of how it would sound, and I didn't want the X to sound like it belongs in the next Fast and the Furious offering. Honestly, I like the note of the I6 with the stock exhaust, just looking to amplify it a tad, and add a horse or two.

I have done a fair amount of searching for 2008 X3 performance parts. Lots of searching, but little finding.
-Dinan advertises no current model performance parts. Also, they will not divulge an email address.
-No Borla exhaust system available.
-No Supersprint exhaust systems listed.
-No intake systems of any kind.
-No software that I could find.
-There may be some European parts, but couldn't find anything concrete and none of the various websites I contacted ever bothered to respond.
-US websites selling BMW performance parts had basically nothing and responded that there was no market that justified development.
-Some limited parts may be available for early models.

If anyone finds anything for a 2008 (I think it is the same motor as the 2007), please let me know.

The high flow air filter - is this a cold air intake for the X3? I had a carbon fiber tube with high flow filter on my Z3. Expensive but nice. Or is it a filter that goes into the existing housing?

It is a K & N filter that fits in the existing airbox. It is what is recommended on the Dinan website. I know there are a lot of people on the forum that seriously hate K & N products for BMW's, but if it is good enough for Dinan, it's good enough for me. I have thought about putting an AFE cold air intake, but I haven't made up my mind yet.

I thought about ordering it, but didn't know much about SuperSprint and their quality at that time. Nor did I have any idea of how it would sound, and I didn't want the X to sound like it belongs in the next Fast and the Furious offering. Honestly, I like the note of the I6 with the stock exhaust, just looking to amplify it a tad, and add a horse or two.

For my Z3, I was able to listen to sound clips and made up my mind quickly. It had a deep rumble. You could tell it was not stock when you get on the gas. When cruising, it just made a pleasant sound. Not too loud, not too quiet. My wife even loved it! Unfortunately, I asked "why not put one on your 530?" She said no to the expense!

I don't think you could go wrong with the SuperSprint. I may still order 1 for her car in the spring and sneak it on!

For my Z3, I was able to listen to sound clips and made up my mind quickly. It had a deep rumble. You could tell it was not stock when you get on the gas. When cruising, it just made a pleasant sound. Not too loud, not too quiet. My wife even loved it! Unfortunately, I asked "why not put one on your 530?" She said no to the expense!

I don't think you could go wrong with the SuperSprint. I may still order 1 for her car in the spring and sneak it on!

Thanks! I may have to scoop one up now.
Good luck sneaking it onto the 530 without her noticing... However tread softly, women can be crafty, ruthless, and unforgiving... That's why I love 'em!

Quite a few of the posts to this thread do not address the original posted issue. What is available for aftermarket exhaust systems for the X3? Any real power gains are in the headers and catalytic converters, mufflers are good for 5 or so rear wheel horsepower at best. Haven't seen any mufflers even that are listed for the present model. This is 2009 and the current powertrain has been out since the 2007 model year. We also need intake systems and reprogramming. Where is it?

Dinan does not offer an email address but their toll free number is 800-341-5480. They have moved their headquarters to Morgan Hill, about 20 miles south of Mountain View, where they still maintain a large service operation. The toll free number is a MtoF 9-5 number.

It sounds nice, but did it actually make a difference in response time?

My Z3 experience was the exhaust did not add a whole lot to the engine's power. The sound difference was incredible.

The main power benefits I found were the Dinan software upgrades which increased redline cutoff and altered the fuel curve. This, coupled with the cold air intake for more air flow, gave quite a boost to my Z3.

As far as the 2007 and up X3's, I suspect BMW has extracted most of the power already. It is probably not worth it to invest too much into perfromance upgrades for the X3. I think you would spend a lot for a very little gain. The only exception would be supercharging. This could give you up to a 60 hp boost for the $5k range.

Supercharging that gains 60 HP for $5000 for the X3? Please back up this opinion with facts. Looks like it is erroneous for availability(no one makes it for X3) and price (BMW superchargers for other models begin at $8k+ without installation). Where can this fantasy product be purchased? Be specific. Provide website info.

Supercharging that gains 60 HP for $5000 for the X3? Please back up this opinion with facts. Looks like it is erroneous for availability(no one makes it for X3) and price (BMW superchargers for other models begin at $8k+ without installation). Where can this fantasy product be purchased? Be specific. Provide website info.

Sorry for the confusion - I was talking cost and performance on the Z3. That was the price for me to do my own install. Pricing depends on brand. Eaton superchargers for the Z3 are in the $5k range. Dinan, on the otherhand, are around $10k.

I will check on the X3 also.

EDIT: Just checked - no supercharger for the E83. I guess we are not worthy! It is funny because I could have gotten a supercharger for my old Lexus LX450 (Land Cruiser) from Toyota Racing Development.